[en] The author reviews recent results obtained in the study of rare decay modes of muons, pions and kaons, considering only K decays which give the same kind of information as the muon or pion decays which he reviews. The various decay modes are regrouped under specific topics: a) Tests of the electroweak gauge theory, including lepton number violating processes, lepton universality and neutrino mixing; b) Structure of mesons including weak and electromagnetic form factors; and c) Other symmetries

[en] Since it first delivered high-intensity beams in 1975, TRIUMF has had a program of research in particle physics based upon the study of rare processes. The interest for these kind of activities is based upon the testing of the successful standard model of electroweak interactions, with the hope of getting a glimpse at physics beyond the standard model. I shall describe four of the recent experiments in this field which are either in the final stages of analysis or in the data-taking phase. These are: the measurement of the π → eν/π → μν branching ratio as a test of electron-muon universality; the search for muonium-antimuonium conversion searching for doubly charged Higgs-like objects; the first measurement of radiative muon capture on hydrogen and measurement of the induced pseudoscalar coupling constant g_p; and, a search for the decay K⁺ → π⁺ + nothing conducted by a TRIUMF team at the Brookhaven Alternating Gradient Synchrotron, which tests predictions of the standard model in a pure second-order weak process

[en] A 100 μA 30 GeV facility, named KAON, could soon be developed at TRIUMF using the present cyclotron as an injector. A wide variety of beams would be provided which would accommodate a very diversified physics program. A flavour of the experimental program will be given together with an outlook of the facilities currently planned for the initial program. (Author) 8 refs., 11 figs., 5 tabs

[en] The decays of the pseudoscalar neutral mesons π degree and eta degree have provided a test of fundamental principles. The main branch, π degree → 2γ, was investigated in the late 60's in the context of current algebra and the decay rate calculated from the singular triangle diagram is in excellent agreement with experiment. Rare leptonic decays of the neutral pseudoscalar mesons are of interest because of the information they reveal about neutral currents or other exotic interactions between leptons and quarks. The author discusses recent information on the π degree → e⁺e^- decay

[en] A description of the search for the rare decay K⁺ → π⁺ν_ν^-at Brookhaven National Laboratory is presented. Results from the 1988 first run are discussed and expectations for the 1989 data set are outlined. Other branches have been searched for using the same detector, and preliminary results are given for K⁺ → π⁺μ^-μ⁺ and K⁺ → π⁺γγ. (Author) 11 refs., 6 figs., tab

[en] A description of the search for the rare decay K⁺ → π⁺ υ antiυ at Brookhaven National Laboratory is presented. Results from the 1988 first run are discussed and expectations for the 1989 data set will be outlined. Other branches have been searched for using the same detector, and preliminary results are given for K⁺ → π⁺ μ^- μ⁺ and K⁺ → π⁺ γ γ

[en] The TRIUMF (Tri-University Mason Facility) cyclotron is centered on large six-sector isochronous cyclotron capable of accelerating negative hydrogen to energy up to 520 MeV. At the present time three photon beams are extracted from the cyclotron-a high-current beam for meson production into six secondary channels, a lower-intensity beam for nuclear and particle research, and a lower-energy beam for isotope production and proton therapy. The proposed exotic beam facilities, ISAC (Isotope Separator and Accelerator) will be able to run at the proton beam current of 10 μA or higher, which will provide both stopped and accelerated radioactive ions. A broad range of radioactive isotopes would be available with unprecedented intensities, and light ions will be accelerated to energies up to 1.5 MeV/atomic mass unit. this would allow many aspects of the program. By the fall of 1998, the new ISAC source will deliver beams to the low-energy experimental area, while the accelerated beams will be available in 2000. Within the past few years, two new, large magnetic spectrometers, CHAOS (Canadian High Acceptance Orbit Spectrometer) and SASP (Second Arm Spectrometer), have been commissioned. Their large acceptance will make possible a new generation of experiments in strong-interaction physics. Weak interaction studies can be conducted with leptons and/or quarks at a fundamental level. Pion decay, parity violation, and rare-decay experiments are examples of such studies that can be performed. A test facility was built several years ago to establish the feasibility of developing radioactive beams at TRIUMF. It has fulfilled this role by developing two rather unique ion sources and delivering high flux alkali metallic or volatile ions. This has enabled the mounting of an active physics program. An international collaboration is studying atomic cross sections for muonic- hydrogen, -deuterium, -tritium scattering. Knowledge of these cross sections is important for the study of muon-catalyzed fusion processes. Over the past year a number of significant scientific results have been published or have been reported at international meetings, as mentioned in references. TRIUMF is also supporting a number of efforts at other facilities as part of its infrastructure role. Significant resources are devoted to support a world-class facility for interdisciplinary research. (J. P.N.)

[en] A 100 μA 30 GeV facility, named KAON, could soon be developed at TRIUMF using the present cyclotron as an injector. A wide variety of beams would be provided which would accommodate a diversified physics program. A open-quote flavor close-quote of the experimental program will be given together with an outlook of the facilities currently planned for the initial program. 8 refs., 11 figs., 5 tabs

[en] This volume contains material presented at the second Lake Louise Winter Institute. The format of the Institute was again three days of pedagogical lectures followed by a topical workshop of shorter papers of the subject of electroweak interactions. Attempts have been made to incorporate results from all energy regimes of subatomic physics; talks ranging from new physics beyond Lep II to studies of β-decay of tritium

No abstract available